Please cite a single case of someone who mixed this wrong and injured themselves.
These are the last two examples that I've witnessed (sorry, I didn't write a paper on it, therefore you have to trust me).
Liveabord on the great barrier reef, somewhere near the Ribbon reefs.
A lady had some ear problem, and another lady told her: "Here, take this, I made it myself: it's a mix of alcohol, vinegar and antibiotics..."
She squirted that thing in her ears and she started to scream because it was burning too much. Unfortunately for her, no more diving on that trip because of that.
Meanwhile, my girlfriend had a problem to her ears too, but she didn't take anything from anyone (oh, what a shame: she doesn't push the limit!!): luckily for her it wasn't a big problem a she was able to dive anyway.
However, at the end of the trip, she went to the doctor, and she also explain what she witnessed from the other lady, and the doctor told her to absolutely avoid any home made potion (and especially if someone else made it).
...but maybe, it's just that down here we're to pussy and we all should avoid to get wet.
And btw, just to explain a little bit more my concern here: I've seen people taking and doing everything to themselves without having any idea of what they were taking or doing to themselves just because they read it somewhere, or someone else told them.
Why? Because ignorance and stupidity are common characteristics of many human beings.
Same applies to some vinegar and alcohol in your ears.